Electrical and Computer Engineering Department, Ben-Gurion University of the Negev, P.O Box 653, IL84105, Beer-Sheva, Israel.
Sci Rep. 2021 Jan 28;11(1):2407. doi: 10.1038/s41598-021-82033-6.
A major challenge in use of the optical spectrum for communication and imaging applications is the scattering of light as it passes through diffuse media. Recent studies indicate that light beams with orbital angular momentum (OAM) can penetrate deeper through diffuse media than simple Gaussian beams. To the best knowledge of the authors, in this paper we describe for the first time an experiment examining transmission of OAM beams through biological tissue with thickness of up to a few centimeters, and for OAM modes reaching up to 20. Our results indicate that OAM beams do indeed show a higher transmittance relative to Gaussian beams, and that the greater the OAM, the higher the transmittance also up to 20, Our results extend measured results to highly multi scattering media and indicate that at 2.6 cm tissue thickness for OAM of order 20, we measure nearly 30% more power in comparison to a Gaussian beam. In addition, we develop a mathematical model describing the improved permeability. This work shows that OAM beams can be a valuable contribution to optical wireless communication (OWC) for medical implants, optical biological imaging, as well as recent innovative applications of medical diagnosis.
在光通信和成像应用中，一个主要的挑战是光在穿过散射介质时的散射。最近的研究表明，具有轨道角动量（OAM）的光束比简单的高斯光束能够更深地穿透散射介质。据作者所知，在本文中，我们首次描述了一个实验，该实验研究了高达几厘米厚的生物组织中 OAM 光束的传输，并且 OAM 模式高达 20。我们的结果表明，OAM 光束确实相对于高斯光束具有更高的透过率，并且 OAM 越大，透过率也越高，最高可达 20。我们的结果将测量结果扩展到高度多散射介质，并表明在 2.6 厘米的组织厚度下，对于阶数为 20 的 OAM，与高斯光束相比，我们测量到的功率增加了近 30%。此外，我们还开发了一个描述改进渗透率的数学模型。这项工作表明，OAM 光束可以为医疗植入物的光无线通信（OWC）、光学生物成像以及最近的医疗诊断创新应用做出有价值的贡献。
